Hello Sean,

On Sat, Feb 10, 2018 at 01:43:28PM +0100, Marcus Folkesson wrote:

Hello Sean,

On Sat, Feb 10, 2018 at 07:10:02PM +0800, Sean Wang wrote:

quoted

Hi, Marcus

The changes you made for dt-bindings and driver should be put into
separate patches.

I actually thought about it but chose to have it in the same patch because I
did not see any direct advantage to separating them.

But I can do that.
I will come up with a v3 with this change if no one thinks differently.

When looking at the git log, I'm not that convinced it should be
separate patches.

For example, I found a4f741e3e157c3a5c8aea5f2ea62b692fbf17338 that is
doing the exact same thing as this patch.

There is plenty of patches that mixes the code change and dt bindings
updates.
Could it not be useful to overview both the implementation and
dt-mapping change in one view?

If you or anyone else still think it should be separated, please let me know and I will
come up with a v3.

quoted

And the property timeout-sec seems to be generic enough to all devices,
so why not add a common document to describe it and allow those devices
to refer to, like other dt-bindings for other kinds of devices usually
did.

It should be, but it requires that the driver is using
watchdog_init_timeout() to set timeout, most of the drivers does not.
Most drivers does not even use the watchdog API but register itself as
misc devices.

When we have all wdt drivers using the watchdog API, we should probably
move the dt-binding to a common document.

quoted

	Sean

Thanks,

Best regards
Marcus Folkesson

quoted

On Sat, 2018-02-10 at 10:19 +0100, Marcus Folkesson wrote:

quoted

watchdog_init_timeout() will allways pick timeout_param since it
defaults to a valid timeout.

By following best practice described in
Documentation/watchdog/watchdog-kernel-api.txt, it also
let us to set timout-sec property in devicetree.

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
---
 Documentation/devicetree/bindings/watchdog/mtk-wdt.txt | 4 ++++
 drivers/watchdog/mtk_wdt.c                             | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
index 5b38a30e608c..859dee167b91 100644
--- a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt

@@ -11,9 +11,13 @@ Required properties:
 
 - reg : Specifies base physical address and size of the registers.
 
+Optional properties:
+- timeout-sec: contains the watchdog timeout in seconds.
+
 Example:
 
 wdt: watchdog@10000000 {
 	compatible = "mediatek,mt6589-wdt";
 	reg = <0x10000000 0x18>;
+	timeout-sec = <10>;
 };

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 7ed417a765c7..fcdc10ec28a3 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c

@@ -57,7 +57,7 @@
 #define DRV_VERSION		"1.0"
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
-static unsigned int timeout = WDT_MAX_TIMEOUT;
+static unsigned int timeout;
 
 struct mtk_wdt_dev {
 	struct watchdog_device wdt_dev;

Best regards
Marcus Folkesson